User blog comment:MegaGyarados/You Guys NEED, AND I MEAN NEED, to understand this (This isn’t about teams again)/@comment-31285191-20180221013432

there is the functioning in which when you throw a master ball in RBY at a glitch pokemon ('M, missingno and many others) will apparently catch the pokemon, then resurface again so you have a copy of the glitch pokemon in a master ball and still be fighting another glitch pokemon